diff --git a/composer.json b/composer.json
index 8f45823..e447232 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
     "require": {
         "php": ">=5.6",
         "psr/http-message": "^1.0",
-        "http-interop/http-middleware": "^0.4.1"
+        "http-interop/http-middleware": "^0.4.1 || ^0.5.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.6 || ^6.1"